﻿using System;
using System.Diagnostics;
using Windows.ApplicationModel;
using Windows.ApplicationModel.Activation;
using Windows.Storage;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;

// The Blank Application template is documented at http://go.microsoft.com/fwlink/?LinkId=234227

namespace EPPlayer
{
    /// <summary>
    /// Provides application-specific behavior to supplement the default Application class.
    /// </summary>
    sealed partial class App : Application
    {
        internal static EPCharacter Character;

        /// <summary>
        /// Initializes the singleton application object.  This is the first line of authored code
        /// executed, and as such is the logical equivalent of main() or WinMain().
        /// </summary>
        public App()
        {
            this.InitializeComponent();
            this.Suspending += OnSuspending;
        }

        /// <summary>
        /// Invoked when the application is launched normally by the end user.  Other entry points
        /// will be used when the application is launched to open a specific file, to display
        /// search results, and so forth.
        /// </summary>
        /// <param name="args">Details about the launch request and process.</param>
        protected override async void OnLaunched(LaunchActivatedEventArgs args)
        {
            Frame rootFrame = Window.Current.Content as Frame;

            // Do not repeat app initialization when the Window already has content,
            // just ensure that the window is active
            if (rootFrame == null)
            {
                // Create a Frame to act as the navigation context and navigate to the first page
                rootFrame = new Frame();

                if (args.PreviousExecutionState == ApplicationExecutionState.Terminated)
                {
                }
                try
                {
                    Character = await PersistentModel.ReadObject("Default.xml");
                }
                catch (Exception e)
                {
                    Debug.WriteLine("Deserialization failed, " + e.ToString());
                    Character = new EPCharacter();
                }

                // Place the frame in the current Window
                Window.Current.Content = rootFrame;
               
            }

            if (rootFrame.Content == null)
            {
                // When the navigation stack isn't restored navigate to the first page,
                // configuring the new page by passing required information as a navigation
                // parameter
                if (!rootFrame.Navigate(typeof(CreateCharacter), args.Arguments))
                {
                    throw new Exception("Failed to create initial page");
                }
            }
            // Ensure the current window is active
            Window.Current.Activate();
        }

        /// <summary>
        /// Invoked when application execution is being suspended.  Application state is saved
        /// without knowing whether the application will be terminated or resumed with the contents
        /// of memory still intact.
        /// </summary>
        /// <param name="sender">The source of the suspend request.</param>
        /// <param name="e">Details about the suspend request.</param>
        private async void OnSuspending(object sender, SuspendingEventArgs e)
        {
            var deferral = e.SuspendingOperation.GetDeferral();
            bool TryRename = false, TryDelete = false;
            const string FileName = "Default.xml";

            try
            {
                await PersistentModel.WriteObject(Character, FileName);
            }
            catch (Exception)
            {
                TryRename = true;
            }
            if (TryRename == true)
            {
                try
                {
                    StorageFile sf = await ApplicationData.Current.LocalFolder.CreateFileAsync(FileName, CreationCollisionOption.OpenIfExists);
                    await sf.RenameAsync("Failed-" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xml");
                }
                catch (Exception Ex)
                {
                    Debug.WriteLine("Failed save rename failed: " + Ex);
                    TryDelete = true;
                }
            }
            if (TryDelete == true)
            {
                try
                {
                    StorageFile sf = await ApplicationData.Current.LocalFolder.CreateFileAsync(FileName, CreationCollisionOption.OpenIfExists);
                    await sf.DeleteAsync();
                }
                catch (Exception)
                {
                    // end of the road.
                }
            }

            deferral.Complete();
        }
    }
}
